Tried the uninstall/reinstall; no help. According to online help about Home Network, it says, "If you haven't already trusted the network, you are prompted to do so the first time that you access the network map." This never happened for me. Never got a prompt. So how do I then trust this network if I never got the prompt? Help instructions are not specific on this matter.

If you plug your PC directly into the device yoru ISP provides - it will look at all the devices on the public IP range which coudl be 100s. I know the error is not helpful - but i suspect that there are too many devices on teh network you are trying to get info on. DO me a favour:

This PC is connected to my home network via a switch and not directly plugged into my router. Full arp -a output is below. I don't see anything abnormal; all the IPs are either on my home network (192.168.1.0/24) or normal ICMP, etc IP addresses. At least to my knowledge.

Sorry for delayed response. Yes, turn off and reboot computer every night. Baring other options from you, I think I'll just connect with online support and let them poke around; see if they can determine the problem.

This forum doeds not allow us to exchange files. Ideally I get some logs off your PC and then we can get some real info to my development team. I will get back to you shartly about how to send me the log files.